Development of Double and Single Hot Thermocouple Technique for in Situ Observation and Measurement of Mold Slag Crystallization.

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  • Kashiwaya Yoshiaki
    Faculty of Engineering, Hokkaido University
  • Cicutti Carlos E.
    Department of Materials Science and Engineering, Carnegie Mellon University
  • Cramb Alan W.
    Department of Materials Science and Engineering, Carnegie Mellon University
  • Ishii Kuniyoshi
    Department of Materials Science and Engineering, Faculty of Engineering, Hokkaido University

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Abstract

To overcome the limitations of differential thermal analysis (DTA) and direct casting experimentation in the measurement and understanding of the solidification phenomena of mold slags, the double and single hot thermocouple techniques (DHTT and SHTT) for the direct observation and measurement of mold slag crystallization were developed. These methods enable the solidification and melting process of transparent slags to be observed "in situ" under conditions where the temperature or temperature gradient can be measured and controlled. The SHTT allows a sample to be subjected to rapid cooling rates or to be held under isothermal conditions. The DHTT allows large temperature gradients to be developed between the two thermocouples and allows a simulation of the transient conditions which can occur in the infiltrated slag film that occurs between the mold and the solidifying shell in the mold of a continuous caster. By these techniques both isothermal and non-isothermal phenomena can be studied. <br> A number of mold slags are optically transparent or translucent at steelmaking temperatures while the crystalline phase which precipitates upon cooling is opaque and can be clearly observed using optical microscopy. Thus the SHTT and DHTT are connected to an image capturing and analysis system that allows the onset and growth of the opaque crystals which precipitate from the slags to be documented. The development and application of these techniques to mold slag crystallization will be discussed in this paper.

Journal

  • ISIJ International

    ISIJ International 38 (4), 348-356, 1998

    The Iron and Steel Institute of Japan

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